Orifice plate type uniform seeding device for wheat seedling culture

Abstract

The invention relates to the technical field of seedling raising and sowing, and particularly discloses a pore plate type wheat seedling raising uniform sowing device which comprises a seedling raising tray and a seedling raising tray conveying mechanism, a sowing mechanism is arranged over a seedling raising tray conveying path, and a seed supply mechanism is arranged over the sowing mechanism. The seeding mechanism comprises two longitudinal beam plates fixed at the upper end of the seedling raising tray conveying mechanism, a pore plate assembly is rotationally arranged between the two longitudinal beam plates, and rotating motors for driving the pore plate assembly to rotate forwards and backwards are arranged on the longitudinal beam plates; compared with an existing air suction roller type wheat seeder, a negative pressure system does not need to be arranged to adsorb seeds, the structure of the seeding device is simplified, the operation cost of the seeding device is reduced, wheat seeds can be filled into each seed filling hole in the seed filling hole plate, and the seed filling holes are uniformly distributed, so that uniform seeding of wheat breeding can be realized; the subsequent reseeding operation of an operator is not needed, and the use effect is very excellent.

Description

Technical Field

[0001] The invention relates to the technical field of seedling cultivation and sowing, and in particular discloses a perforated plate type wheat seedling cultivation and uniform sowing device. Background Art

[0002] In the early screening and generation stages of wheat breeding, uniform sowing using seedling trays is an important breeding safeguard measure to improve efficiency and ensure data accuracy. Existing sowing devices for wheat seedlings mainly use air-suction drum-type wheat seeders. The seed seeder has multiple groups of seed suction holes evenly opened on the outer surface of the drum, and uses a negative pressure system to continuously pump air into the drum during operation, thereby using the negative pressure of the seed suction holes to absorb the wheat seeds in the seed filling area. After the wheat seeds are absorbed, they rotate with the drum to a certain height, and then the negative pressure is blocked, allowing the wheat seeds to fall naturally under the action of gravity, and then the seed guide tube or other seed guide mechanism will discharge them into the seedling tray.

[0003] However, the existing air suction drum type wheat seeder still has some shortcomings when used in the wheat seedling sowing process. First, it is necessary to set up negative pressure adsorption to continuously evacuate the inside of the drum, which leads to increased equipment manufacturing costs and operating costs; second, compared with spherical seeds such as soybeans and rapeseed, the overall shape of wheat seeds is irregular. When the wheat seeds are sucked by the seed suction holes, the wheat seeds cannot completely fit with the hole walls of the seed suction holes, which leads to serious air leakage on both sides of the seed suction holes, and cannot provide sufficient air pressure difference for the wheat seeds to be adsorbed and fixed. Once the wheat seeds are not sucked on some of the seed suction holes, the subsequent seedling sowing will be uneven, and the operator will need to perform replanting operations. Therefore, in response to the above-mentioned technical problems and shortcomings of the existing air suction drum type wheat seeder when used in the wheat seedling sowing process, the present application proposes a newly designed hole plate type wheat seedling uniform sowing device to solve the above-mentioned problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a perforated plate type wheat seedling uniform sowing device to solve the above technical problems and shortcomings of the existing air suction drum type wheat seeder in the wheat seedling sowing process.

[0005] The present invention is achieved through the following technical solutions:

[0006] A perforated plate type wheat seedling uniform sowing device comprises a seedling tray and a seedling tray conveying mechanism, a sowing mechanism is arranged directly above the seedling tray conveying path, a seed supply mechanism is arranged directly above the sowing mechanism, the sowing mechanism comprises two longitudinal beams fixed to the upper end of the seedling tray conveying mechanism, a perforated plate assembly is rotatably arranged between the two longitudinal beams, and a rotating motor is arranged on the longitudinal beam for driving the perforated plate assembly to rotate forward and reverse;

[0007] The orifice plate assembly includes a rectangular frame, a telescopic driving member is provided at one side end of the rectangular frame, and the end of the telescopic driving member is connected to a sealing plate located in the rectangular frame, a seed filling orifice plate is fixed on the rectangular frame, a plurality of longitudinally arranged raised guide bars are evenly spaced on the upper surface of the seed filling orifice plate, a row of seed filling holes is evenly spaced on the seed filling orifice plate between two adjacent raised guide bars, a sealing plate is slidingly provided on the lower surface of the seed filling orifice plate, and a seed drop hole corresponding to each seed filling hole is provided on the sealing plate, and an adjustment component is provided on the rectangular frame to drive the sealing plate to move and align or misalign the seed filling hole with the seed drop hole;

[0008] The seed supply mechanism is connected to a bracket on two longitudinal beam plates. A seed box and a transmission mechanism for driving the seed box to move horizontally are arranged in the bracket. A quantitative seed feeding mechanism is arranged at the lower end of the seed box.

[0009] As a further configuration of the above solution, a transverse slide rail is provided on the lower surface of the seed filling plate, and a dovetail slide groove interacting with the transverse slide rail is provided on the upper surface of the sealing plate.

[0010] As a further arrangement of the above scheme, the left and right ends of the sealing plate are provided with downwardly extending convex plates, and the adjustment component includes a spring and a magnetic block respectively arranged on the two convex plates, and the other end of the spring is connected to the rectangular frame, and the rectangular frame is provided with an electromagnet that acts on the magnetic block.

[0011] As a further arrangement of the above scheme, a convex shaft is provided in the middle of the left and right side surfaces of the rectangular frame, and a bearing seat connected to the convex shaft is provided on the two longitudinal beam plates. The rotating motor is fixed on one of the longitudinal beam plates and connected to the convex shaft.

[0012] As a further arrangement of the above scheme, a rectangular opening is opened in the transverse direction at the upper end of the bracket, roller grooves are provided on the brackets on both sides of the rectangular opening, the seed box is arranged in the rectangular opening, and rollers that interact with the roller grooves are provided on the sides of the seed box.

[0013] As a further arrangement of the above scheme, the transmission mechanism includes two synchronous wheels arranged at the left and right ends of the bracket, and the end of one of the synchronous wheels is connected to a transmission motor, a synchronous belt is arranged between the two transmission wheels, and the seed box is fixedly connected to the synchronous belt.

[0014] As a further arrangement of the above scheme, the quantitative seeding mechanism includes a shell connected to the seed box and having an opening at the lower end, a groove wheel is rotatably arranged in the shell, the end of the groove wheel is concentrically connected to a seeding shaft extending out of the shell, and a gear is arranged at the outer end of the seeding shaft, and a rack meshing with the gear is fixed on the bracket.

[0015] As a further arrangement of the above scheme, a seed unloading guide plate is provided in the rectangular frame below the edge sealing plate, and a seed return conveying cylinder with an upper end opening is fixed between the two longitudinal beam plates below the seed unloading guide plate. An auger blade shaft is provided in the seed return conveying cylinder, and one end of the auger blade shaft is connected to a return motor, and a drop opening is provided on the lower surface of the end of the seed return conveying cylinder.

[0016] As a further arrangement of the above scheme, a laser ranging sensor is provided on the seedling tray conveying mechanism, and the laser ranging sensor is located on the vertical plane of the longitudinal center of the orifice plate assembly. A sensing protrusion is provided at the middle position of the seedling tray, which protrudes upward and can block the light of the laser ranging sensor.

[0017] As a further configuration of the above scheme, the diameters of the seed filling hole and the seed drop hole are the same, and both are located between 1.2 and 1.4 times the average particle size of wheat seeds. The upper end of the seed filling hole is also provided with a guide angle for convenient filling of wheat seeds.

[0018] Beneficial effects:

[0019] The seeding tray is moved to the position directly below the seeding tray, and the sealing plate is moved a short distance so that the seeding holes and the seed dropping holes are accurately aligned up and down. At this time, the wheat seeds filled in each seeding hole will fall vertically into the seeding tray under the action of gravity, thereby making the wheat seeds in the seeding tray evenly distributed.

[0020] Compared with the existing air suction drum type wheat seeder, the present invention does not need to set up a negative pressure system to adsorb seeds, simplifies the structure of the sowing device and reduces its operating cost. Each filling hole in the filling hole plate can be filled with wheat seeds. In addition, the uniform distribution of the filling holes can achieve uniform sowing of wheat breeding, and there is no need for operators to perform subsequent replanting operations. Its use effect is very excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the front side of the present invention;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the back side of the present invention;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the sowing mechanism and the seed supply mechanism in the present invention;

[0025] Figure 4 This is a schematic diagram of the three-dimensional structure of the orifice plate assembly from a first angle of view in the present invention;

[0026] Figure 5 This is a schematic diagram of the third perspective structure of the orifice plate assembly of the present invention;

[0027] Figure 6 Schematic diagram of the three-dimensional structure of the filling hole plate, sealing hole plate, etc. in the present invention;

[0028] Figure 7 Schematic diagram of the three-dimensional structure of the seed supply mechanism in the present invention;

[0029] Figure 8 Schematic diagram of the internal three-dimensional structure of the quantitative seeding mechanism in the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Figures 1 to 8 , and describes the application in detail with reference to embodiments.

[0032] Example 1

[0033] Example 1 discloses a hole plate type wheat seedling uniform sowing device, refer to the attached Figure 1 and attached Figure 2The main body of the device includes a base 1, a seedling tray conveying mechanism 2, a seedling tray 3, a sowing mechanism 4 and a control box 5. The seedling tray conveying mechanism 2 is arranged on the upper surface of the base 1, the control box 5 is arranged on the front side of the base 1, the seedling tray 3 is arranged on the seedling tray conveying mechanism 2 so that it can be transported horizontally, and the sowing mechanism 4 is arranged just above the moving path of the seedling tray 3.

[0034] In the specific design, the seedling tray conveying mechanism 2 includes a conveying seat 201 fixed on the upper surface of the base 1, and a wheel axle 202 is provided at each end of the left and right ends of the conveying seat 201, and the end of one of the wheel axles 202 is connected to a conveying motor 203, and then one or more conveyor belts 204 spaced front and back are provided between the left and right wheel axles 202, so that after the seedling tray 3 is placed on the upper end of the conveyor belt 204, it can be transported from left to right by the conveyor belt 204.

[0035] Reference Attachment Figure 3 The sowing mechanism 4 comprises two longitudinal beams 401 arranged parallel to each other at the upper ends of the conveyor seat 201. An orifice plate assembly 400 is disposed between the two longitudinal beams 401. A protruding shaft 402 is disposed at the center of each of the left and right side surfaces of the orifice plate assembly 400. Bearing blocks 403 connected to the corresponding protruding shafts 402 are disposed on the upper surfaces of the longitudinal beams 401. A rotating motor 404 connected to the protruding shaft 402 is also disposed on one of the longitudinal beams 401. Furthermore, a seed supply mechanism 6 is disposed between the two longitudinal beams 401, which delivers a fixed amount of wheat seeds onto the upper surface of the orifice plate assembly 400.

[0036] Reference Attachment Figure 4 , Attachment Figure 5 and attached Figure 6The orifice plate assembly 400 comprises a rectangular frame 4001, with two protruding shafts 402 fixedly connected to the middle positions of the left and right sides of the rectangular frame 4001. A telescopic drive member 4002 is provided on the front side of the rectangular frame 4001. This telescopic drive member 4002 can be a pneumatic cylinder or an electric telescopic rod. The end of the telescopic drive member 4002 is connected to an edge plate 4003 located within the rectangular frame 4001. A seed unloading guide plate 4004 is also provided within the rectangular frame 4001 below the edge plate 4003. A seed filling orifice plate 4005 is fixed within the rectangular frame 4001. The upper surface of the seed filling orifice plate 4005 is evenly spaced with a plurality of longitudinally arranged raised guide bars 4006, forming a concave rolling strip groove between adjacent raised guide bars 4006. A row of seed filling holes 4007 is evenly spaced on the bottom wall of each rolling strip groove. A sealing plate 4008 is attached to the lower surface of the seed filling hole plate 4005. The sealing plate 4008 is provided with a seed placement hole 4009 corresponding to each seed filling hole 4007. Furthermore, two parallel dovetail grooves 4010 are provided on the upper surface of the sealing plate 4008, and a transverse slide 4011 is provided on the lower surface of the seed filling hole plate 4005 to interact with the two dovetail grooves 4010. This allows the sealing plate 4008 to move left and right along the transverse slide 4011, thereby allowing the seed filling holes 4007 and the sealing plate 4008 to be concentrically aligned or offset from each other.

[0037] In order to achieve automatic movement and adjustment of the sealing plate 4008, downwardly extending protrusions 4012 are provided at both ends of the sealing plate 4008, and springs 4013 and magnetic blocks 4014 are respectively provided on the outer sides of the two protrusions 4012. The spring 4013 is connected to the inner side of the rectangular frame 4001, and then an electromagnet 4015 aligned with the magnetic block 4014 is fixed on the other side of the rectangular frame 4001. The above-described design scheme can generate a magnetic attraction force on the magnetic block 4014 by passing a current through the electromagnet 4015, thereby overcoming the elastic force of the spring 4013 and aligning the seed holes 4009 on the sealing plate 4008 with the seed filling holes 4007 on the seed filling plate 4005. When the current flowing into the electromagnet 4015 is disconnected, the spring 4013 causes the sealing plate 4008 to move, thereby offsetting the seed holes 4009 from the seed filling holes 4007, allowing the sealing plate 4008 to seal all the seed filling holes 4007. In addition, in the specific design, the seed filling holes 4007 and the seed dropping holes 4009 have the same aperture and are located between 1.2 and 1.4 times the average particle size of the wheat seeds. At the same time, the upper end of the seed filling hole 4007 is configured with a guide angle, with the upper end being wider and the lower end being narrower, so that the wheat seeds can be quickly filled therein.

[0038] Reference Attachment Figure 7 and attached Figure 8The seed supply mechanism 6 includes a bracket 601 longitudinally extending across the top of the orifice plate assembly 400. A rectangular opening is defined at the upper end of the bracket 601, perpendicular to the raised guide strips 4006. Roller grooves 602 are located on both sides of the rectangular opening. A seed box 603 is located within the rectangular opening. A row of rollers 603 are located on both sides of the rectangular opening, each of which moves along the roller grooves 602. A quantitative seed placement mechanism is located at the lower end of the seed box 603. The quantitative seed placement mechanism includes a housing 604 connected to the lower end of the seed box 603. The lower end of the housing 604 is provided with a seed placement opening. A sheave 605 is rotatably connected to the housing 604. A seed placement shaft 606 extending from the housing 604 is concentrically located on the end face of the sheave 605. A gear 607 is located at the outer end of the seed placement shaft 606. A rack 608 is fixed to the bracket 601, meshing with the gear 607 and parallel to the length of the rectangular opening.

[0039] Finally, a transmission mechanism for driving the seed box 603 to move is also provided in the bracket 601. The transmission mechanism includes synchronous wheels 609 arranged at the left and right ends of the bracket 601, one of the synchronous wheels 609 is connected to a transmission motor 610, and then a synchronous belt 611 is provided between the two transmission wheels 609, and a connecting piece fixedly connected to the synchronous belt 611 is provided on the outer surface of the seed box 603.

[0040] During the operation of the perforated plate type wheat seedling uniform sowing device disclosed in this embodiment 1, the wheat seeds are first loaded into the seed box 603, and then the transmission motor 610 is started, so that the seed box 603 can be driven to move back and forth horizontally once under the action of the synchronous belt 611. During the movement of the seed box 603, the meshing action between the gear 607 and the rack 608 causes the groove wheel 605 to rotate inside the shell 604, and then the groove wheel 605 is used to uniformly drop the wheat seeds into the upper surface of the seed filling perforated plate 4005 in the horizontal direction, so that the wheat seeds in the two adjacent rolling strip grooves are basically the same.

[0041] Next, the rotary motor 404 is started to rotate forward and reverse for a period of time, with each rotation angle controlled within 30 degrees. Under the action of the rotary motor 404, the orifice plate assembly 400 rotates and tilts around the convex shaft 402. After the orifice plate assembly 400 tilts to a certain angle, the wheat seeds in the rolling groove will roll toward the downwardly inclined end and enter the seed filling hole 4007 during the rolling process. Then, after tilting back to a certain angle, the wheat seeds originally gathered at one end will roll along the rolling groove toward the other end. After the wheat seeds are rolled back and forth for a period of time, each seed filling hole 4007 can be filled with the same amount of wheat seeds. Finally, the telescopic drive member 4002 is controlled to shorten, and the edge sealing plate 4003 opens one end of the seed filling orifice plate 4005. After the rotary motor 404 adjusts it to the tilted downward state, the excess wheat seeds will fall from the seed discharge guide plate 4004.

[0042] When the seed filling hole 4007 is filled with seeds, the rotating motor 404 first adjusts the orifice plate assembly 400 to a horizontal position, and then starts the conveying motor 203, so that the seedling tray 3 is moved to the bottom of the orifice plate assembly 400 under the action of the conveyor belt 204, and then current is passed through the electromagnet 4015 to cause it to act on the magnetic block, thereby overcoming the elastic force of the spring 4013, so that the seeding hole 4009 on the sealing plate 4008 is concentrically aligned with the seeding hole 4007 on the seeding hole plate 4005. At this time, the wheat seeds filled in the seeding hole 4007 will fall vertically into the soil of the seeding tray 3 through the seeding hole 4009, so that the sown wheat seeds can be evenly sown in the seeding tray 3. After sowing is completed, the seeding tray 3 can be sent out by the conveyor belt 204.

[0043] Example 2

[0044] Example 2 discloses a hole plate type wheat seedling uniform sowing device that is further improved and designed based on the technical solution in Example 1. The similarities between it and Example 1 will not be described again.

[0045] Reference Attachment Figure 1 and attached Figure 2 A laser distance sensor 7 is provided at the rear end of the conveying seat 201, and the laser distance sensor 7 is located on a vertical plane at the longitudinal center of the orifice plate assembly 400. Then, a sensing protrusion 301 that protrudes upward and can block the light of the laser distance sensor 7 is provided at the middle position of the upper end of the front side or rear side of the seedling tray 3. This embodiment 2 is designed with the above scheme. When the conveyor belt 204 delivers the seedling tray 3 to the bottom of the orifice plate assembly 400, when the sensing protrusion 301 on the seedling tray 3 is aligned with the laser distance sensor 7 front to back, the laser distance sensor 7 will feed back the detection signal to the control box 5, and then the control box 5 will immediately control the conveying motor 203 to stop running, so that the seedling tray 3 can be accurately controlled to be located directly below the orifice plate assembly 400.

[0046] Reference Attachment Figure 1 and attached Figure 3A seed return conveying cylinder 8 is fixed to the front end of the two longitudinal beams 401. An inoculation port 801 is provided at the position where the upper end of the seed return conveying cylinder 8 is aligned with the orifice plate assembly 400. An auger blade shaft 802 is provided in the seed return conveying cylinder 8, and one end of the auger blade shaft 802 is connected to a return motor 803. A drop opening 804 is provided on the lower surface of the end of the seed return conveying cylinder 8, and an inoculation guide hopper 805 is provided on the base 1 directly below the drop opening 804. This embodiment 2 is designed through the above scheme. When the seed filling hole plate 4005 completes the seed filling, the telescopic driving part 4002 is first controlled to shorten so that the edge sealing plate 4003 opens one end of the seed filling hole plate 4005, and then the rotating motor 404 adjusts the seed filling hole plate 4005 to a state where the front end is tilted downward. At this time, the excess wheat seeds will be guided by the seed unloading guide plate 4004 to fall into the seed return conveying cylinder 8, and after the wheat seeds in the seed return conveying cylinder 8 reach a certain amount, the return motor 803 can be started, and then the returned wheat seeds will be discharged from the drop port 804 under the action of the auger blade shaft 802, and fall into the collection box after passing through the inoculation guide bucket 805.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A perforated plate type wheat seedling uniform sowing device, comprising a seedling tray and a seedling tray conveying mechanism, characterized in that: A sowing mechanism is provided just above the seedling tray conveying path, and a seed supply mechanism is provided just above the sowing mechanism. The sowing mechanism includes two longitudinal beams fixed to the upper end of the seedling tray conveying mechanism, a hole plate assembly is rotatably provided between the two longitudinal beams, and a rotating motor for driving the hole plate assembly to rotate forward and reverse is provided on the longitudinal beams; The orifice plate assembly includes a rectangular frame, a telescopic driving member is provided at one side end of the rectangular frame, and the end of the telescopic driving member is connected to a sealing plate located in the rectangular frame, a seed filling orifice plate is fixed on the rectangular frame, a plurality of longitudinally arranged raised guide bars are evenly spaced on the upper surface of the seed filling orifice plate, a row of seed filling holes is evenly spaced on the seed filling orifice plate between two adjacent raised guide bars, a sealing plate is slidingly provided on the lower surface of the seed filling orifice plate, and a seed drop hole corresponding to each seed filling hole is provided on the sealing plate, and an adjustment component is provided on the rectangular frame to drive the sealing plate to move and align or misalign the seed filling hole with the seed drop hole; The seed supply mechanism is connected to a bracket on two longitudinal beam plates. A seed box and a transmission mechanism for driving the seed box to move horizontally are arranged in the bracket. A quantitative seed feeding mechanism is arranged at the lower end of the seed box.

2. The perforated plate type wheat seedling uniform sowing device according to claim 1, characterized in that: The lower surface of the seed filling plate is provided with a transverse slide rail, and the upper surface of the sealing plate is provided with a dovetail slide groove that interacts with the transverse slide rail.

3. The perforated plate type wheat seedling uniform sowing device according to claim 2, characterized in that: The left and right ends of the sealing plate are both provided with downwardly extending convex plates, and the adjustment component includes a spring and a magnetic block respectively arranged on the two convex plates, the other end of the spring is connected to the rectangular frame, and the rectangular frame is provided with an electromagnet that acts on the magnetic block.

4. The perforated plate type wheat seedling raising and uniform sowing device according to claim 1, characterized in that: A convex shaft is provided in the middle of the left and right sides of the rectangular frame, and a bearing seat connected to the convex shaft is provided on the two longitudinal beam plates. The rotating motor is fixed on one of the longitudinal beam plates and connected to the convex shaft.

5. The perforated plate type wheat seedling raising and uniform sowing device according to claim 1, characterized in that: The upper end of the bracket is provided with a rectangular opening arranged in the transverse direction, and the brackets on both sides of the rectangular opening are provided with roller grooves. The seed box is arranged in the rectangular opening, and rollers that interact with the roller grooves are provided on the sides of the seed box.

6. The perforated plate type wheat seedling raising and uniform sowing device according to claim 5, characterized in that: The transmission mechanism includes two synchronous wheels arranged at the left and right ends of the bracket, and the end of one of the synchronous wheels is connected to the transmission motor. A synchronous belt is arranged between the two transmission wheels, and the seed box is fixedly connected to the synchronous belt.

7. The perforated plate type wheat seedling raising and uniform sowing device according to claim 6, characterized in that: The quantitative seeding mechanism includes a shell connected to the seed box and having an opening at the lower end. A groove wheel is rotatably arranged in the shell. The end of the groove wheel is concentrically connected to a seeding shaft extending out of the shell, and a gear is provided at the outer end of the seeding shaft. A rack meshing with the gear is fixed on the bracket.

8. The perforated plate type wheat seedling raising and uniform sowing device according to claim 1, characterized in that: A seed unloading guide plate is provided in the rectangular frame below the edge sealing plate, and a seed return conveying cylinder with an upper end opening is fixed between the two longitudinal beam plates below the seed unloading guide plate. An auger blade shaft is provided in the seed return conveying cylinder, and one end of the auger blade shaft is connected to a return motor, and a drop opening is provided on the lower surface of the end of the seed return conveying cylinder.

9. The perforated plate type wheat seedling raising and uniform sowing device according to claim 1, characterized in that: A laser ranging sensor is provided on the seedling tray conveying mechanism, and the laser ranging sensor is located on the vertical plane of the longitudinal center of the orifice plate assembly. A sensing protrusion is provided at the middle position of the seedling tray, which protrudes upward and can block the light of the laser ranging sensor.

10. The perforated plate type wheat seedling raising and uniform sowing device according to claim 1, characterized in that: The diameters of the seed filling hole and the seed drop hole are the same, and both are located between 1.2 and 1.4 times the average particle size of the wheat seeds. The upper end of the seed filling hole is also provided with a guide angle for conveniently filling in the wheat seeds.

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